This is all it takes to turn it on. Question is whether anything else needs to be fixed.

Tryserver says we choke at rm -f libalerts_s.dylib /bin/sh: -c: line 0: syntax error near unexpected token `;' /bin/sh: -c: line 0: `for lib in growl/libgrowl_s.a ; do ar x ${lib}; ; done' make[8]: *** [libalerts_s.dylib] Error 2 make[7]: *** [libs] Error 2 make[6]: *** [tools] Error 2 make[5]: *** [components_tools] Error 2 make[4]: *** [tools_tier_platform] Error 2 make[3]: *** [tier_platform] Error 2 make[2]: *** [default] Error 2 make[1]: *** [build] Error 2 make: *** [build] Error 2 program finished with exit code 2 http://tinderbox.mozilla.org/showlog.cgi?log=MozillaTry/1281417267.1281422588.16866.gz&fulltext=1

That'd be this line here failing: http://mxr.mozilla.org/mozilla-central/source/config/rules.mk#1216 because $(CLEANUP2) is empty.

We probably should set it to true at http://mxr.mozilla.org/mozilla-central/source/config/rules.mk#1192 then.

Actually it's possible that it's CLEANUP1 from the definition of SUB_LOBJS. We should probably just define CLEANUP1 and CLEANUP2 to be true in that block and see if it works.